In the appendix of Shadow of Mordor for The One Ring it says
“The One Ring was forged at Orodruin and perfected by his captive, the Elven lord Celebrimbor. Sauron invested much of his power into The One Ring, and Celebrimbor, unbeknown to the Dark Lord, gave it a will of it’s own."
In an answer on the site on Celembrimbor and the One Ring, the following can be found:
"So, you bear so much of your maker's nature, let's give you a will of your own and see how Sauron enjoys being "served" by an intelligence as duplicitous and ambitious as his own!" Atticus_of_Amber - Shadow of Mordor - Celebrimbor and The One Ring
However looking through both games again I can't find this quote. So is there anywhere in both games where it is stated outside the appendix what Celebrimbor did to Sauron's ring and where?